Unable to compile SMP kernel without debug

["Rauf Kuliyev" <rauf@xxxxxxxxxxx>]

I tried to compile kernel without debug and with SMP on 1.6.1 and got:

linking kernel.nodebug
kern_spinlock.o(.text+0x28b): In function `exponential_backoff':
: undefined reference to `db_print_backtrace'
*** Error code 1

Stop in /usr/obj/usr/src/sys/TEST.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.

Kernel config here: www.kuliyev.com/TEST

Rauf